pretty nice photos. i think the colors of the first one work especially well with the black bg. though maybe a little more contrast would be good on her head and arms

:scratch: these don't look quite finished... legs and faces are cut off. hair needs a little more work too. there's a few places where the bg hasn't been completely removed (esp. #5, top left quadrant). it seems like some of them, especially the ones where the shadowy areas don't melt into the black bg, are waiting for something other than the black bg, some kind of underlaid backdrop?

did you do any ps work besides masking? i'm guessing you did, or you had some pretty good lighting technique that day why not both

if you plan on doing lots of subject/background separation in the future, i would recommend you learn how to use the channels to mask. it's easier and more effective than the wand, but it's hard to figure out at first.